With the script I munged up, if I start with this:
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and do a selection to alpha then alpha to path, running the script will do this:
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Enlarging and shrinking the selection first (to make an outside path and an inside path), then running the script first on the outside then on the inside I got something like this (after playing with spacing and such):
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Of course, randomness lengths could be added in. Unfortunately, pdb calls won't use new settings like jitter ;(

Let me know and I'll upload a copy if this is the effect you are looking for.

-Rob A>